Blade-sharpening machine



W. E. NICKER'S-ON.

BLADE SHARPENING MACHINE.

APPHCATION FILED OCT" 21;, 1919.

l 2731 3 Patented Aug. 29, 1922.

W .22 MM DELAWARE.

Mnssaonusnms, Assrenon To; GILLETTE massacnnsn-rrs, a oonroea'rron or BLADE-SHARPENING MACHINE.

readies.

specification of Letters Patent.

Original application filed November 19, 1917, Serial No. 202,708. Divided and this application filed I October 28, 1919. Serial No. 334,081.

T 0 allwhom it may concern:

Be it known that 1, WILLIAM E. NICKER- son, a citizen of the United States, residing at Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Blade-Sharpening Machines, of which the following is a specification.

This invention relates to blade sharpening machines and more particularly to an apparatus for applying dressing to the rotating hone of a machine, such for example as that illustrated and described in my coendingapplication Serial No. 202708, filed ovem'be'r i9, 191?, of which this application constitutes a division. 7 v

The principal object of this invention is to provide a mechanism which will automatically apply dressingto the honing wheel of a blade sharpening machine at a predetermined interval in the cycle of operation.

In the accompanying drawings;

Figure 1 is a fragmentary front elevation of a machine embodying my improvements.

Figure 2 is a sectional elevation at approximately the line 2-2 of Figure 1; and

Figure 3 is a detail view, mainly in sec tion of the dressing applying device.

The greater part of the mechanism of the blade sharpening machine illustrated in my copending application, above referred to, has been omitted from the drawings of this application, only such parts as are associated with the subject matter of this application being illustrated.

In general my apparatus comprises a stick of dressing paste carried by a holder which is movable toward and away from the hone to which the dressing is to be applied and is so arranged that the paste stick is presented endwise to the hone, against which it is held by spring pressure when moved into contact with it. In the construction illustrated the parts just referred to are mounted on a bracket 7 located in proximity to the honing wheel 3, which is cylindrical in form and has both a rotary and an axially reciprocatory motion, the paste holder being carried by an arm 52 pivotally mounted on the projecting end of a shaft 45 which constitutes a part of the blade-sharpening mechanism.

The stick of paste is shown at 53, and is held at its lower end in a cup 49 attached at its center to the upper end of a downwardlyextending stem 50 rotatably mounted in and supported by a tubular socket 51 carried by the free end of the arm 52. The stem 50 of the cup 49 is inclined at a slight angle to the axis of the wheel 3, as shown in Figure 3, and consequently when the upper end of the paste stick 53 is raised into contact with the wheel the rotation of thelatter causes the paste stick and the cup to rotate also, so that the paste stick is worn down uniformly on all sides. The paste is also distributed on the cylindrical surface of the wheel 3 by reason of the combined rotation and axial reciprocation of the latter, which brings all parts of its operative surface into contact with the paste stick while the latter is held in elevated position.

For-lifting the arm 52 to bring about the dressing of the wheel 3, as above described, I employ a tension spring 5st connecting an upwardly-projecting extension of said arm to the bracket 7, as shown in Figure 1, so that the paste stick is elevated by the spring 54' whenever such movement is permitted. The arm 52 is normally held in its lowered position, however, by means of another arm 55 pivotally mounted on a fixed stud 56 and carrying at its free end a pin 57 which overlies the arm 52, the arm 55 being acted upon by spring 58 which tends to depress the pin 57 and is strong enough to overcome the effect of the spring 54. The arm 55 is automatically elevated against the action of the spring 58 by means of an arm 59 connected at one end to the hub of the arm 55 and at its other end to a pull-rod 60 which extends upward to an overhead mechanism, the latter being arranged to lift the arm 59 at such intervals as may be necessary for properly dressing the wheel 3. The normal position of the cup 49 may be varied from time to time, according to the length of the paste stick, by providing the arm 59 with a series of perforations 61, into any one of which the lower end of the pull-rod 60 can be hooked, and after a paste stick has been used up it can be readily renewed by depressing the arm 52 and then lifting the cup 49 and stem 50 out of the socket 51.

It will be evident that this mechanism provides means for applying an abrasive dressing to the honing wheel in an efficient and positive manner, it being possible to use a rotatable dressing holder of this character either manually or in cooperation with an automatic mechanism as herein set forth.

I claim:

1. Means for applying dressing to a grinding wheel, Comprising a stick of dressing paste, a holder to which the stick is secured at one end, and a support in which the holder is detachably mounted for rotation on an axis extending lengthwise of the stick;

2. The combination with a grinding wheel ofmeans for applying dressing thereto, comprising a stick of dressing paste, a holder to which the stick is secured at one end, said holder being rotatably mounted on an axis extending lengthwise of the stick and inclined with respect to the axis of the wheel,

and, means for moving the free end of the stick into and out of contact with the wheel.

In a blade-sharpening machine, the combination with a grinding wheel of means for dressing the same comprising a stick of dressing material, a holder therefor, a support on which the holder is rotatably mounted with its axis inclined to the axis of the grinding wheel, and means for moving the v support and holder toward and away from the wheel.

4. In a blade-sharpening machine, the combination with a grinding wheel of means memes for dressing the same comprising a stick of dressing material, a holder therefor, a support on which the holder is mounted, a spring constantly tending tomove the support toward the wheel, a spring-actuated ally-mounted arm movable toward and away from the wheel, a spring connected to the arm and tending to move the latter toward the wheel, a cup removably supported by the arm and adapted to carry a stick of dressing material, said cup being provided with a central stem rotatably mounted in the arm and extending at an inclination to the axis of the grinding wheel, and means for normally holding said arm away from the wheel and permitting it to move toward the latter when required.

Signed at Boston, Mass, this 22nd day of October, 1919. i 7

WILLIAM E. NICKERSON, 

